feat(perf): 🎸 enable thorvg multi threaded rendering

[theashraf]

Fixes #141

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[theashraf]

@hermet after enabling thorvg multi threaded rendering, i'm not getting the frame buffer updated anymore and getting a blank canvas.

in thorvg.rs module, i'm passing the threads count to tvg_engine_init, am i missing something ?

impl Canvas {
    pub fn new(engine_method: TvgEngine, threads: u32) -> Self {
        let engine = match engine_method {
            TvgEngine::TvgEngineSw => Tvg_Engine_TVG_ENGINE_SW,
            TvgEngine::TvgEngineGl => Tvg_Engine_TVG_ENGINE_GL,
        };

        let init_result = unsafe { tvg_engine_init(engine, threads) };

        if init_result != Tvg_Result_TVG_RESULT_SUCCESS {
            panic!("Failed to initialize ThorVG engine");
        }

        Canvas {
            raw_canvas: unsafe { tvg_swcanvas_create() },
            engine_method: engine,
        }
    }
  ....

[hermet]

@theashraf What value did you use for the thread number, and which platform did you test it on? Please note that SharedArrayBuffer, required in web, would have a security issue now, the thorvg intrinsic thread feature might not be proper for the web (let me double check it) but other platforms such as android and iOS should be ok.

+ @tinyjin

[theashraf]

@hermet, I've tested it on Rust on my macOS, not on the web. I set the number of threads to 1, as shown in this rust example.

I'm not trying to test it on the web for now. I want to ship this for platforms with native threading capability, like iOS and Android.

[tinyjin]

@theashraf Hello, Ashraf. I've only tested the native threading in web. It required enabling a few options

• -pthread
• -sUSE_PTHREADS=1
• -sPTHREAD_POOL_SIZE

Of course, they're part of Emscripten flags, I'm not sure it'd help even in Android, iOS and Rust.